Simplify sidenav, do not make it fixed

[sssoz]

See DOAJ/doajPM#3435

See comment in https://github.com/DOAJ/doajPM/issues/3435#issuecomment-1557370263

Categorisation

This PR...

• has scripts to run — CSS recompile
• has migrations to run
• adds new infrastructure
• changes the CI pipeline
• affects the public site
• affects the editorial area
• affects the publisher area
• affects the monitoring

Basic PR Checklist

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Code Style

• No deprecated methods are used

  • N/A
  • Developer
  • Reviewer

• No magic strings/numbers - all strings are in constants or messages files

  • N/A
  • Developer
  • Reviewer

• ES queries are wrapped in a Query object rather than inlined in the code

  • N/A
  • Developer
  • Reviewer

• Where possible our common library functions have been used (e.g. dates manipulated via dates)

  • N/A
  • Developer
  • Reviewer

• Cleaned up commented out code, etc

  • N/A
  • Developer
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Testing

• Unit tests have been added/modified

  • N/A
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• Functional tests have been added/modified

  • N/A
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• Code has been run manually in development, and functional tests followed locally

  • N/A
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Documentation

• FeatureMap annotations have been added

  • N/A
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• Documentation updates - if needed - have been identified and prepared for inclusion into main documentation (e.g. added and highlighted/commented as appropriate to this PR)

  • N/A
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• Core model documentation has been added to if needed: https://docs.google.com/spreadsheets/d/1lun2S9vwGbyfy3WjIjgXBm05D-3wWDZ4bp8xiIYfImM/edit

  • N/A
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• Events and consumers documentation has been added if needed: https://docs.google.com/spreadsheets/d/1oIeG5vg-blm2MZCE-7YhwulUlSz6TOUeY8jAftdP9JE/edit

  • N/A
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• The docs for this branch have been generated and pushed to the doc site (see docs/README.md for details)

  • N/A
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Release Readiness

• If needed, migration has been created and tested locally

  • N/A
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• Release sheet has been created, and completed as far as is possible https://docs.google.com/spreadsheets/d/1Bqx23J1MwXzjrmAygbqlU3YHxN1Wf7zkkRv14eTVLZQ/edit#gid=1722827182

  • N/A
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• There has been a recent merge up from develop (or other base branch). List the dates of the merges up from develop below

  • [date of merge up]

Testing

Team to just review the admin area and confirm that the navigation is ok

Deployment

What deployment considerations are there? (delete any sections you don't need)

Configuration changes

What configuration changes are included in this PR, and do we need to set specific values for production

Scripts

What scripts need to be run from the PR (e.g. if this is a report generating feature), and when (once, regularly, etc).

Migrations

What migrations need to be run to deploy this

Monitoring

What additional monitoring is required of the application as a result of this feature

New Infrastructure

What new infrastructure does this PR require (e.g. new services that need to run on the back-end).

Continuous Integration

What CI changes are required for this

[RK206]

Closing as discussed in https://github.com/DOAJ/doajPM/issues/3803